CN220505705U

CN220505705U - Screw rod, Z-axis lifting device and three-dimensional printer

Info

Publication number: CN220505705U
Application number: CN202321867858.9U
Authority: CN
Inventors: 黄少辉
Original assignee: Shenzhen Anycubic Technology Co Ltd
Current assignee: Shenzhen Anycubic Technology Co Ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2024-02-20
Anticipated expiration: 2033-07-14

Abstract

The utility model discloses a screw rod, a Z-axis lifting device and a three-dimensional printer, which relate to the technical field of printing equipment and mainly aim to prevent the screw rod from eccentrically rotating when rotating, so as to prevent a printing head from shaking when moving along the Z axis, and improve the printing quality of a model. The main technical scheme of the utility model is as follows: the Z-axis lifting device is applied to a three-dimensional printer and comprises a bracket; the screw rod comprises a first end section, a second end section and an intermediate section connected between the first end section and the second end section; the diameter of the first end section and the diameter of the second end section are different from the diameter of the middle section, and the first end section and the second end section are rod sections obtained by processing the end parts of the screw rod; the first end section, the second end section, and the intermediate section are coaxial; the first end section and the second end section are rotatably connected with the bracket.

Description

Screw rod, Z-axis lifting device and three-dimensional printer

Technical Field

The utility model relates to the technical field of three-dimensional printing equipment, in particular to a screw rod, a Z-axis lifting device and a three-dimensional printer.

Background

A three-dimensional printer is a device for rapid prototyping to construct objects, which is based on data model files, using bondable materials such as powdered metals or plastics, and constructing three-dimensional models by means of layer-by-layer printing.

The three-dimensional printer generally comprises a Z-axis lifting mechanism for driving the printing head to move along the Z-axis direction, at present, the Z-axis lifting mechanism generally comprises a screw rod transmission mechanism, such as a 3D printer double-Z-axis synchronous mechanism disclosed in a patent with publication number CN214214772U, and specifically discloses that rollers and screw rods nuts are installed on two sides of the printing head, a driving motor and screw rods are installed on two sides of a support, the screw rods nuts and the screw rods are matched to form a screw rod transmission mechanism, the rollers and the support are matched to form a sliding rail structure, the printing head moves along the support under the driving of the screw rod transmission mechanism, namely, the screw rods of the screw rod transmission mechanism become main tracks for Z-axis movement of the printing head.

However, because the length of the screw rod is longer, the coaxiality of the two ends of the screw rod is generally poor, and thus the screw rod is easy to eccentrically rotate during rotation, so that the printing head is easy to shake during movement along the Z axis, and the printing quality of a model is reduced.

Disclosure of Invention

In view of the above, the embodiment of the utility model provides a screw rod, a Z-axis lifting device and a three-dimensional printer, which mainly aims to prevent the screw rod of the Z-axis lifting device from eccentric rotation during rotation, thereby preventing a printing head from shaking during movement along the Z-axis and improving the printing quality of a model.

In order to achieve the above purpose, the present utility model mainly provides the following technical solutions:

in one aspect, an embodiment of the present utility model provides a lead screw, including a first end section, a second end section, and an intermediate section connected between the first end section and the second end section;

the diameter of the first end section and the diameter of the second end section are different from the diameter of the middle section, and the first end section and the second end section are rod sections obtained by processing the end parts of the screw rod; the first end section, the second end section, and the intermediate section are coaxial.

In another aspect, an embodiment of the present utility model provides a Z-axis lifting device, which is applied to a three-dimensional printer, including:

a screw as described above, and a bracket;

the first end section and the second end section are rotatably connected with the bracket.

Further, the diameter of the first end section and the diameter of the second end section are smaller than the diameter of the middle section, and the support is in transmission connection with the step surfaces at the two ends of the middle section;

the support comprises a transverse frame, two vertical frames, a first connecting piece and a driving piece, wherein the two vertical frames are correspondingly and vertically connected to two ends of the transverse frame, the first connecting piece is connected to one vertical frame, and the driving piece is connected to the other vertical frame;

the number of the screw rods is two, the first end sections of the two screw rods are respectively connected with the transverse frame in a rotating way, the second end section of one screw rod is connected with the first connecting piece in a rotating way, and the second end section of the other screw rod is connected with the driving piece in a driving way;

the two screw rods are in transmission connection through a transmission mechanism.

Further, the first connecting piece comprises a first fixing piece and a first bearing, the first fixing piece is connected to the vertical frame, a mounting groove is formed in the first fixing piece, and the first bearing is inserted into the mounting groove;

the second end section of the screw rod is inserted into the inner ring of the first bearing;

a second step is formed between the second end section and the middle section of the screw rod, and the second step is abutted to the large-diameter end face of the first bearing.

Further, the driving piece comprises a motor and a coupler, the motor is connected to the vertical frame, one end of the coupler is connected with an output shaft of the motor, and the other end of the coupler is connected with a second end section of the screw rod;

a second step is formed between the second end section and the middle section of the screw rod, and the step surface of the second step is in transmission connection with the coupler.

Further, the bracket further comprises two second connecting pieces, and the two second connecting pieces are correspondingly connected to two ends of the transverse frame;

the first end sections of the two screw rods are correspondingly connected with the second connecting piece in a rotating way;

one second connecting piece and the first connecting piece are in transmission connection with the step surfaces at two ends of the middle section of the corresponding screw rod, and the other second connecting piece and the driving piece are in transmission connection with the step surfaces at two ends of the middle section of the corresponding screw rod.

Further, the transmission mechanism comprises a synchronous belt, a first synchronous wheel and a second synchronous wheel, and a first step is formed between the first end section and the middle section of the screw rod;

the first synchronous wheel is sleeved on a first end section of the screw rod, and a step surface of the first step is in transmission connection with the first synchronous wheel;

the second synchronous wheel is sleeved on the first end section of the other screw rod, and the step surface of the first step is in transmission connection with the second synchronous wheel;

the first synchronous wheel and the second synchronous wheel are in transmission connection through the synchronous belt.

Further, the second connecting piece comprises a second fixing piece and a second bearing, the second fixing piece is connected with the transverse frame, a through hole is formed in the second fixing piece, and the second fixing piece is sleeved outside the second bearing through the through hole and is abutted against a flange of the second bearing;

the first end section of the screw rod is inserted into the inner ring of the second bearing;

the first step is abutted with the first synchronous wheel, and the first synchronous wheel is abutted with the large-diameter end face of the second bearing.

Further, annular bosses are arranged on the end faces of the first synchronous wheel and the second synchronous wheel, and the annular bosses are abutted with the inner ring of the second bearing.

On the other hand, the embodiment of the utility model also provides a three-dimensional printer which comprises the Z-axis lifting device.

By means of the technical scheme, the utility model has at least the following beneficial effects:

in the technical scheme provided by the embodiment of the utility model, in order to improve the overall coaxiality of the screw rod, the two end parts of the screw rod are subjected to secondary finish machining, and higher machining precision is provided through secondary finish machining, so that the overall screw rod subjected to secondary finish machining has higher coaxiality; therefore, the diameter of the first end section and the diameter of the second end section of the processed screw rod are different from those of the middle section, the first end section and the second end section are rod sections obtained after the end of the screw rod is processed, and meanwhile, the first end section, the second end section and the middle section are coaxial, that is, the two ends of the screw rod are mechanically processed (such as cutting) to obtain the first end section and the second end section which are coaxial with the middle section, so that the coaxiality of the screw rod is ensured, the phenomenon that the screw rod eccentrically rotates during rotation is avoided, shaking of a printing head during movement along a Z axis is effectively avoided, and the printing quality of a model is improved.

Drawings

FIG. 1 is an exploded view of a Z-axis lifting device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a Z-axis lifting device according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a screw in a Z-axis lifting device according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a first synchronizing wheel or a second synchronizing wheel of a transmission mechanism in a Z-axis lifting device according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a coupling of a driving member in a Z-axis lifting device according to an embodiment of the present utility model.

Reference numerals illustrate:

1-a bracket; 2-a screw rod; 21-a second end section; 22-a first end section; 23-an intermediate section; 11-a cross frame; 111-a second opening; 12-a vertical frame; 13-a first connector; 14-a driving member; 131-a first securing member; 132-a first bearing; 221-a first step; 141-a motor; 142-a coupling; 1421-opening; 15-a second connector; 151-a second mount; 152-a second bearing; 1511-a through hole; 211-a second step; 31-a synchronous belt; 32-a first synchronizing wheel; 32-a second synchronizing wheel; 321-annular boss; 100-printheads; 4-a cross beam; 5-nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the preferred embodiments of the present utility model will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present utility model.

As shown in fig. 3, an embodiment of the present utility model provides a screw 2 including a first end section 22, a second end section 21, and an intermediate section 23 connected between the first end section 22 and the second end section 21; the diameter of the first end section 22 and the diameter of the second end section 21 are different from those of the middle section 23, and the first end section 22 and the second end section 21 are rod sections obtained by processing the end parts of the screw rod 2; the first end section 22, the second end section 21 and the intermediate section 23 are coaxial.

In this embodiment, in order to improve the coaxiality of the whole screw rod 2, the two end portions of the screw rod 2 are subjected to secondary finish machining, and higher machining precision is provided through secondary finish machining, so that the whole screw rod 2 subjected to secondary finish machining has higher coaxiality; therefore, the diameter of the first end section 22 and the diameter of the second end section 21 of the machined screw rod 2 are different from those of the middle section 23, the first end section 22 and the second end section 21 are rod sections obtained by machining the end parts of the screw rod 2, and meanwhile, the first end section 22, the second end section 21 and the middle section 23 are coaxial, that is, the two ends of the screw rod 2 are machined (such as cutting) to obtain the first end section 22 and the second end section 21 which are coaxial with the middle section 23, so that the coaxiality of the screw rod 2 is ensured, and further the phenomenon that the screw rod 2 eccentrically rotates during rotation is avoided.

It will be appreciated that the diameters of the first and second end sections 22, 21 are smaller than the diameter of the intermediate section 23, and that the diameters of the first and second end sections 22, 21 may be the same or different, provided that the first and second end sections 22, 21 are machined to be coaxial with the intermediate section 23.

As shown in fig. 1, 2 and 3, the embodiment of the utility model also provides a Z-axis lifting device, which is applied to a three-dimensional printer and comprises a bracket 1; the screw 2 according to the previous embodiment, the first end section 22 and the second end section 21 of the screw 2 are rotatably connected to the bracket 1. Specifically, the Z-axis lifting device may further include a nut 5, where the nut 5 is in threaded connection with the middle section 23 of the screw rod 2, and the nut 5 may be connected to the print head 100 of the three-dimensional printer through the cross beam 4, and in the process of rotating the screw rod 2 relative to the bracket 1, the nut 5 may drive the print head 100 to move along the middle section 23.

According to the Z-axis lifting device provided by the embodiment of the utility model, the screw rod 2 has higher coaxiality, so that the phenomenon that the screw rod 2 eccentrically rotates during rotation is avoided, the shaking of a printing head during movement along the Z axis is effectively avoided, and the printing quality of a model is improved.

For ease of processing, in the embodiment of the present utility model, referring to fig. 1 and 3, the diameter of the first end section 22 and the diameter of the second end section 21 are smaller than the diameter of the middle section 23, and the bracket 1 is in driving connection with the stepped surfaces at both ends of the middle section 23.

When the two ends of the screw rod 2 are mechanically processed, the threaded parts at the two ends can be directly turned by a lathe, so that the two ends of the screw rod are thinned by processing to obtain the coaxial first end section 22 and the coaxial second end section 21, no additional material is needed, the processing is convenient, and the cost is reduced. Of course, when machining both ends of the screw 2 to obtain the first end section 22 and the second end section 21 which are coaxial, it should be ensured that the diameters of both cannot be too thin to ensure the strength of the screw 2. Further, since the first end section 22 and the second end section 21 are machined at both end sections of the screw rod, and the diameters of the first end section 22 and the second end section 21 are smaller than those of the intermediate section 23, a step surface is formed between the first end section 22 and the intermediate section 23 due to the diameter difference, and a step surface is formed between the second end section 21 and the intermediate section 23 due to the diameter difference, that is, both ends of the intermediate section 23 have step surfaces. The support 1 is tightly pressed on the step surfaces at the two ends of the middle section 23, and the clamping of the screw rod 2 is realized by applying pressure along the length direction of the screw rod 2 to the step surfaces at the two ends of the middle section 23. Therefore, the screw rod 2 is in rotary connection with the bracket 1, and planar contact transmission is realized through the rotatable part of the bracket and the step surfaces at the two ends of the middle section 23 (namely, the screw rod 2 is driven to rotate by virtue of friction between the rotatable part and the step surfaces at the two ends of the middle section 23, so that transmission connection is realized).

Further, for ease of installation, the diameters of the first end section 22 and the second end section 21 may be equal.

In the embodiment of the present utility model, referring to fig. 1 and 2, the bracket 1 is a portal frame, and may include a transverse frame 11, two vertical frames 12, a first connecting member 13 and a driving member 14, where the two vertical frames 12 are correspondingly connected to two ends of the transverse frame 11, and the installed vertical frames 12 are perpendicular to the transverse frame 11; the first connecting member 13 is connected to one of the vertical frames 12, and the driving member 14 is connected to the other vertical frame 12. The number of the screw rods 2 is two, the first end sections 22 of the two screw rods 2 are respectively and rotatably connected with the transverse frame 11, the second end section 21 of one screw rod 2 is rotatably connected with the first connecting piece 13, and the second end section 21 of the other screw rod 2 is in driving connection with the driving piece 14; the two screw rods 2 are in transmission connection through a transmission mechanism 3.

In the above embodiment, when the driving member 14 is started, the driving member 14 can drive the screw rods 2 connected with the driving member 14 to rotate, and as the two screw rods 2 are in transmission connection through the transmission mechanism 3, the other screw rod 2 can rotate along with the screw rods 2, so that the purpose that one driving member 14 can drive the two screw rods 2 to rotate is achieved, the cost is reduced, and the power consumption is saved.

The print head of the three-dimensional printer can be movably connected with the two vertical frames 12 through the cross beam 4, and meanwhile, the cross beam 4 is correspondingly in threaded connection with the middle sections 23 of the two screw rods 2 through the two screw nuts 5, so that when the two screw rods 2 rotate, the cross beam 4 can drive the print head 100 to stably move along the two screw rods 2, and the print head 100 can stably move on the support 1.

In this embodiment, support 1 of box formula 3D printer is rectangular frame, and lead screw 2 corresponds to be set up on rectangular frame's 4 bight positions, and the step face at the interlude 23 both ends of lead screw 2 is connected with rectangular frame's upper and lower both ends transmission. The heating platform is connected with the screw rod 2, so that displacement in the Z-axis direction is realized through the screw rod 2. The support 2 may also be other types of support structures, not illustrated herein.

In the embodiment of the present utility model, referring to fig. 1 and 2, the first connecting member 13 may include a first fixing member 131 and a first bearing 132, where the first fixing member 131 is connected to the vertical frame 12, and a mounting groove 1311 is formed on the first fixing member 131, and the first bearing 132 is inserted into the mounting groove 1311; the second end section 21 of the screw rod 2 is inserted into the inner ring of the first bearing 132; a second step 211 is formed between the second end section 21 and the middle section 23 of the screw rod 2, and the second step 211 abuts against the large-diameter end surface of the first bearing 132.

In the above embodiment, the diameter of the second end section 21 of the screw 2 is smaller than the diameter of the intermediate section 23, whereby a first step 221 is formed between the second end section 21 and the intermediate section 23 of the screw 2; when the screw rod 2 is assembled, the first step 221 of the screw rod 2 is abutted against the inner ring of the first bearing 132, the first step 221 plays a limiting role on the screw rod 2, and axial movement of the screw rod 2 can be avoided, so that the installation stability of the screw rod 2 is improved.

The whole diameter of the screw rod in the prior art is the same, when the screw rod is connected with the first connecting piece 13, in order to avoid the screw rod from sliding into the first connecting piece 13, a machining fixing piece is additionally added on the screw rod, the machining fixing piece is fixedly connected with the screw rod, and the screw rod is sleeved outside the screw rod, so that the end of the screw rod sleeved with the machining fixing piece is larger than a sliding-in port (namely an inserting hole of a bearing) of the first connecting piece 13, and the screw rod is prevented from sliding into the first connecting piece 13. Compared with the screw rods used in the prior art, steps are formed between the two end sections and the middle section of the screw rod 2 in the embodiment, when the screw rod 2 is connected with the first connecting piece 13, the screw rod 2 can be abutted against the surface of the first connecting piece 13 through the second step 211 between the middle section 23 and the second end section 21 and is abutted against the large-diameter end face of the first bearing. Since the diameter of the middle section of the screw 2 is larger than the diameter of the second end section, the diameter of the first bearing 132 is smaller than the diameter of the middle section of the screw and larger than/equal to the diameter of the second end section, so that the second end section can be inserted into the first bearing 132 but the middle section cannot be accessed, thereby avoiding the need to use an additional machining fixture to avoid the screw 2 from sliding directly into the first connector 13.

In the above embodiment, the two ends of the first bearing 132 are the large diameter end and the small diameter end respectively; in the prior art, since the diameters of the whole screw rods are the same, the first bearing 132 is assembled in such a manner that the small diameter end is inserted into the mounting groove 1311 of the first fixing member 131 and the large diameter end is located outside the mounting groove. In order to avoid displacement of the first bearing 132 during the working process, at least two screws are required to be additionally installed on the first fixing member 131, and the large diameter end of the first bearing 132 is pressed by the nuts of the screws to fix the first bearing 132.

Because the first bearing 132 is inserted into the mounting groove 1311 of the first fixing member 131, and the second step 211 of the screw rod 2 is abutted against the large-diameter end face of the first bearing 132 (at this time, the second step 211 is equivalent to a nut in the prior art), so that the first bearing 132 can be clamped and fixed between the first fixing member 131 and the screw rod 2, when the first fixing member 131, the first bearing 132 and the screw rod 2 are mounted, only the first bearing 132 is required to be mounted into the mounting groove 1311, then the screw rod 2 is inserted into the inner ring of the first bearing 132, and meanwhile, the first step 221 is abutted against the inner ring of the first bearing 132, so that the assembly between the screw rod 2 and the first connecting member 13 can be completed, and the screw rod and other connecting members can be not required to be used for connection, thereby not only improving the assembly efficiency, but also reducing the assembly materials and reducing the cost.

Wherein, can set up annular step on the inner peripheral wall of mounting groove 1311, first bearing 132 inserts and establishes in mounting groove 1311, and the flange joint of first bearing 132 is on annular step, simultaneously, the surface of first bearing 132 flushes with the surface of first mounting 131 to the dismouting of first connecting piece 13 of being convenient for.

In the embodiment of the present utility model, referring to fig. 1 and 2, the driving member 14 may include a motor 141 and a coupling 142, the motor 141 is connected to the vertical frame 12, one end of the coupling 142 is connected to an output shaft of the motor 141, and the other end of the coupling 142 is connected to the second end section 21 of the screw 2; a second step 211 is formed between the second end section 21 and the middle section 23 of the screw rod 2, and the step surface of the second step 211 is in transmission connection with the coupler 142.

In the above embodiment, the diameter of the second end section 21 of the screw 2 is smaller than the diameter of the intermediate section 23, whereby a second step 211 is formed between the second end section 21 and the intermediate section 23 of the screw 2; the second step 211 of the screw rod 2 is abutted against the coupler 142, the step surface of the second step 211 is tightly contacted with the coupler 142, and a large friction force is arranged between the contact surfaces of the second step 211 and the coupler 142, so that planar contact transmission is realized between the second step 211 and the coupler 142, the second step 211 plays a limiting role on the screw rod 2, axial movement of the screw rod 2 can be avoided, and the installation stability of the screw rod 2 is improved.

Specifically, the coupling 142 may be a hugging type rigid coupling, and a notch 1421 communicating with the internal through hole is formed on the coupling 142, where the notch 1421 divides the coupling 142 into two separate ends, and the two ends are connected by using screws. During installation, the coupling 142 can be tightly held by tightening the nuts on the bolts so as to tightly hold the output shaft of the motor 141 and the second end section 21, thereby improving the connection firmness between the two. Preferably, the coupling 142 is a through 5mm bore, thereby reducing overall size and material costs.

In the embodiment of the present utility model, referring to fig. 1 and 2, the bracket 1 may further include second connecting members 15, where the second connecting members 15 are correspondingly connected to two ends of the cross frame 11, one second connecting member 15 is opposite to the first connecting member 13, and the other second connecting member 15 is opposite to the driving member 14; the first end section 22 of one screw 2 is rotatably connected to the second connecting member 15, and the first end section 22 of the other screw 2 is rotatably connected to the other second connecting member 15 such that the one screw 2 rotates between the second connecting member 15 and the first connecting member 13 and the other screw 2 rotates between the second connecting member 15 and the driving member 14. Wherein, two lead screws 2 after connection are perpendicular to the transverse frame 11.

Further, one second connecting piece 15 and one first connecting piece 13 are in transmission connection with the step surfaces at two ends of the middle section 23 of the corresponding screw rod, and the other second connecting piece 15 and the driving piece 14 are in transmission connection with the step surfaces at two ends of the middle section 23 of the corresponding screw rod.

Specifically, a second connecting piece 15 and a first connecting piece 13 are respectively arranged at two ends of the corresponding screw rod 2, and the two connecting pieces are tightly pressed against the step surfaces at two ends of the middle section 23 of the screw rod 2, so that pressure is applied to the step surfaces at two ends of the middle section 23 in the length direction of the screw rod 2, and the second connecting piece 15 and the first connecting piece 13 tightly clamp the screw rod 2. When the transmission piece of the second connecting piece 15 transmits power, the screw rod 2 is driven by the friction force of the contact surface between the second connecting piece 15 and the step surface, and the first connecting piece is driven by the friction force of the contact surface between the step surface and the first connecting piece 13, so that planar power transmission is realized. The other second connecting piece 15 and the driving piece 14 are tightly pressed against the step surfaces at the two ends of the middle section 23 of the corresponding screw rod, and the other second connecting piece 15 and the driving piece 14 are tightly pressed against the step surfaces at the two ends of the middle section 23 of the screw rod 2, so that pressure is applied to the step surfaces at the two ends of the middle section 23 in the length direction of the screw rod 2; the power transmission between the other second connecting member 15, the screw 2 and the driving member 14 is as described above, and will not be described here. In this embodiment, the connecting pieces at two ends of the screw rod 2 press the step surfaces at two ends of the middle section 23 of the screw rod 2, so as to apply pressure on the step surfaces in the length direction of the screw rod 2, thereby realizing the fixation and power transmission of the screw rod 2. Compared with the screw rods with the same overall diameter in the prior art, the prior art needs to apply pressure in the radial direction of the screw rods to realize the fixed connection between the connecting pieces and the two ends of the screw rods (such as using screws to fix the two ends of the screw rods and the power transmission structure of the connecting pieces in the radial direction of the screw rods), and the screw rods 2 of the embodiment can realize the purposes of screw rod fixation and power transmission without adding additional fixing pieces, so that the structure can be effectively simplified and the production cost can be reduced.

In the embodiment of the present utility model, referring to fig. 1 and 2, the second connecting piece 15 includes a second fixing piece 151 and a second bearing 152, the second fixing piece 151 is connected with the cross frame 11, a through hole 1511 is formed on the second fixing piece 151, and the second fixing piece 151 is sleeved outside the second bearing 152 through the through hole 1511 and is abutted against a flange of the second bearing 152; the first end section 22 of the screw rod 2 is inserted into the inner ring of the second bearing 152; a first step 221 is formed between the first end section 22 and the intermediate section 23 of the screw 2, the first step 221 abuts against the first synchronizing wheel 32, and the first synchronizing wheel abuts against the large-diameter end surface of the second bearing 152.

In the above embodiment, the diameter of the first end section 22 of the screw 2 is smaller than the diameter of the intermediate section 23, whereby a first step 221 is formed between the first end section 22 and the intermediate section 23 of the screw 2; since the second fixing member 151 abuts against the flange of the second bearing 152, and the second step 211 of the screw 2 abuts against the first synchronizing wheel 32, the second bearing 152 abuts against the second fixing member 151 and the first synchronizing wheel 32, respectively, so that the second bearing 152 can be clamped and fixed between the second fixing member 151 and the screw 2. Therefore, when the second fixing member 151, the second bearing 152 and the screw rod 2 are mounted, only the second bearing 152 is required to be sleeved outside the first end section 22, the inner ring of the second bearing 152 is enabled to be abutted against the boss of the synchronizing wheel 151, the synchronizing wheel 151 is abutted against the first step 221, then the second fixing member 151 is sleeved outside the second bearing 152, the second fixing member 151 is enabled to be abutted against the flange of the second bearing 152, finally the second fixing member 151 is connected and fixed with the transverse frame 11, and the second connecting member 15 and the screw rod 2 can be assembled without connecting with a connecting member such as a screw, so that the assembly efficiency is improved, the assembly materials are reduced, and the cost is reduced. Specifically, when the second bearing 152 is assembled in the existing design, the large-diameter end surface is located at the side far away from the synchronizing wheel, so that at least two screws are required to be added on the second fixing piece 151, and the outer wall of the second bearing 152 at the side far away from the synchronizing wheel 151 is pressed by the nuts of the screws, so that the second bearing 152 is prevented from falling off. In this embodiment, when the second bearing 152 is assembled, the large-diameter end face is located at the side close to the synchronizing wheel, and the small-diameter end passes through the through hole 1511 on the second fixing member 151; at this time, the large diameter end of the second bearing 152 cannot pass through the through hole 1511. Meanwhile, the large diameter end surface of the second bearing 152 is abutted with the synchronizing wheel 151, the synchronizing wheel 151 is abutted with the first step 221, and the second bearing 152 is not separated due to the fact that the synchronizing wheel 151 is supported by the first step 221 of the screw rod, and therefore additional fixing screws are not needed to be arranged for fixing the second bearing 152.

In the embodiment of the present utility model, referring to fig. 1 and 2, the transmission mechanism 3 may include a timing belt 31, a first timing wheel 32, and a second timing wheel 33; the first synchronous wheel 32 is sleeved on the first end section 22 of one screw rod 2, and the step surface of the first step 221 is in transmission connection with the first synchronous wheel 32;

the second synchronizing wheel 33 is sleeved on the first end section 22 of the other screw rod 2, and the step surface of the first step 221 is in transmission connection with the second synchronizing wheel 33; the first synchronizing wheel 32 and the second synchronizing wheel 33 are in driving connection through the synchronous belt 31.

In the above embodiment, the corresponding synchronizing wheel is sleeved on the first end section 22 of the screw rod 2 and clamped between the corresponding second bearing 152 and the first step 221, so when the second fixing piece 151, the second bearing 152, the corresponding synchronizing wheel and the screw rod 2 are installed, only the corresponding synchronizing wheel and the second bearing 152 need to be sleeved outside the first end section 22 in sequence, and the corresponding synchronizing wheel is abutted against the first step 221, so that a larger friction force exists between the step surface of the first step 221 and the contact surface of the corresponding synchronizing wheel, planar power transmission is realized, and the step surface of the first step 221 is in transmission connection with the corresponding synchronizing wheel; and then the second fixing piece 151 is sleeved outside the second bearing 152, the second fixing piece 151 is abutted against the flange of the second bearing 152, and finally the second fixing piece 151 is fixedly connected with the transverse frame 11, so that the assembly of the synchronous wheel corresponding to the second connecting piece 15 and the screw rod 2 can be completed, and the synchronous wheel, the screw rod and the other connecting pieces can be connected without adopting screws, thereby not only improving the assembly efficiency, but also reducing assembly materials and reducing the cost.

In order to improve the transmission stability between the first synchronizing wheel 32 or the second synchronizing wheel 33 and the synchronous belt 31, in the embodiment of the present utility model, referring to fig. 4, meshing teeth 322 are disposed on the outer wall circumferences of the first synchronizing wheel 32 and the second synchronizing wheel 33 to increase the friction between the corresponding synchronizing wheel and the synchronous belt 31, thereby improving the transmission stability between the synchronizing wheel and the synchronous belt 31; of course, the inner wall of the synchronous belt 31 may also be provided with a meshing tooth, so that the meshing tooth of the synchronous belt 31 is meshed with the meshing tooth 322 of the corresponding synchronous wheel, thereby further improving the stability of transmission between the synchronous wheel and the synchronous belt 31.

In the embodiment of the present utility model, referring to fig. 1, 2 and 4, annular bosses 321 are disposed on end surfaces of the first synchronizing wheel 32 and the second synchronizing wheel 33, and the annular bosses 321 are abutted against an inner ring of the second bearing 152.

In the above embodiment, the annular boss 321 is disposed on the end surfaces of the first synchronizing wheel 32 and the second synchronizing wheel 33, so that the first synchronizing wheel 32 and the second synchronizing wheel 33 are abutted against the inner ring of the second bearing 152 through the annular boss 321, so that the corresponding synchronizing wheel, the screw rod 2 and the inner ring of the second bearing 152 rotate relative to the outer ring of the second bearing 152 at the same time, and the gasket is prevented from being disposed between the corresponding synchronizing wheel and the second bearing 152 (the gasket is required to be disposed in the existing design, so that the synchronizing wheel with the gasket is not directly contacted with the fixed outer wall of the second bearing 152, and thus the rotation can be realized), not only the assembly efficiency is improved, but also the assembly materials are reduced, and the cost is reduced. Specifically, for ease of use, the annular boss 321 may be disposed coaxially with the corresponding synchronizing wheel.

The embodiment of the utility model also provides a three-dimensional printer which comprises the Z-axis lifting device.

The three-dimensional printer provided by the embodiment of the utility model comprises the Z-axis lifting device, so that the three-dimensional printer comprises all the beneficial effects of the Z-axis lifting device, and the description is omitted.

The embodiment of the utility model provides a screw rod, which comprises a first end section 22, a second end section 21 and an intermediate section 23 connected between the first end section 22 and the second end section 21;

the diameter of the first end section 22 and the diameter of the second end section 21 are different from those of the middle section 23, and the first end section 22 and the second end section 21 are rod sections obtained by processing the end parts of the screw rod 2; the first end section 22, the second end section 21 and the intermediate section 23 are coaxial.

The embodiment of the utility model also provides a Z-axis lifting device which is applied to the three-dimensional printer and comprises the screw rod 2 and the bracket 1;

the first end section 22 and the second end section 21 are rotatably connected to the support 1.

Wherein the diameter of the first end section 22 and the diameter of the second end section 21 are smaller than the diameter of the middle section 23, and the bracket 1 is in transmission connection with the step surfaces at the two ends of the middle section 23;

the bracket 1 comprises a transverse frame 11, two vertical frames 12, a first connecting piece 13 and a driving piece 14, wherein the two vertical frames 12 are correspondingly and vertically connected to two ends of the transverse frame 11, the first connecting piece 13 is connected to one vertical frame 12, and the driving piece 14 is connected to the other vertical frame 12;

the number of the screw rods 2 is two, the first end sections 22 of the two screw rods 2 are respectively and rotatably connected with the transverse frame 11, the second end section 21 of one screw rod 2 is rotatably connected with the first connecting piece 13, and the second end section 21 of the other screw rod 2 is in driving connection with the driving piece 14;

the two screw rods 2 are in transmission connection through a transmission mechanism 3.

The first connecting piece 13 comprises a first fixing piece 131 and a first bearing 132, the first fixing piece 131 is connected to the vertical frame 12, a mounting groove 1311 is formed in the first fixing piece 131, and the first bearing 132 is inserted into the mounting groove 1311;

the second end section 21 of the screw rod 2 is inserted into the inner ring of the first bearing 132;

a second step 211 is formed between the second end section 21 and the middle section 23 of the screw rod 2, and the second step 211 abuts against the large-diameter end surface of the first bearing 132.

The driving piece 14 comprises a motor 141 and a coupler 142, the motor 141 is connected to the vertical frame 12, one end of the coupler 142 is connected with an output shaft of the motor 141, and the other end of the coupler 142 is connected with the second end section 21 of the screw rod 2;

a second step 211 is formed between the second end section 21 and the middle section 23 of the screw rod 2, and the step surface of the second step 211 is in transmission connection with the coupler 142.

Wherein, the bracket 1 further comprises two second connecting pieces 15, and the two second connecting pieces 15 are correspondingly connected to the two ends of the transverse frame 11;

the first end sections 22 of the two screw rods 2 are correspondingly connected with the second connecting piece 15 in a rotating way;

one second connecting piece 15 and the first connecting piece 13 are in transmission connection with the step surfaces at two ends of the middle section 23 of the corresponding screw rod, and the other second connecting piece 15 and the driving piece 14 are in transmission connection with the step surfaces at two ends of the middle section 23 of the corresponding screw rod.

The transmission mechanism 3 comprises a synchronous belt 31, a first synchronous wheel 32 and a second synchronous wheel 33, and a first step 221 is formed between the first end section 22 and the middle section 23 of the screw rod 2;

the first synchronous wheel 32 is sleeved on the first end section 22 of one screw rod 2, and the step surface of the first step 221 is in transmission connection with the first synchronous wheel 32;

the second synchronizing wheel 33 is sleeved on the first end section 22 of the other screw rod 2, and the step surface of the first step 221 is in transmission connection with the second synchronizing wheel 33;

the first synchronizing wheel 32 and the second synchronizing wheel 33 are in driving connection through the synchronous belt 31.

The second connecting piece 15 includes a second fixing piece 151 and a second bearing 152, the second fixing piece 151 is connected with the transverse frame 11, a through hole 1511 is formed in the second fixing piece 151, and the second fixing piece 151 is sleeved outside the second bearing 152 through the through hole 1511 and is abutted against a flange of the second bearing 152;

the first end section 22 of the screw rod 2 is inserted into the inner ring of the second bearing 152;

the first step 221 abuts against the first synchronizing wheel 32, and the first synchronizing wheel 32 abuts against the large diameter end surface of the second bearing 152.

The end surfaces of the first synchronizing wheel 32 and the second synchronizing wheel 33 are provided with annular bosses 321, and the annular bosses 321 are abutted against the inner ring of the second bearing 152.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A screw rod, characterized by comprising a first end section, a second end section, and an intermediate section connected between the first end section and the second end section;

2. The utility model provides a Z axle elevating gear is applied to three-dimensional printer which characterized in that includes: the lead screw of claim 1, and a bracket;

3. The Z-axis lifting device according to claim 2, wherein,

the diameter of the first end section and the diameter of the second end section are smaller than the diameter of the middle section, and the support is in transmission connection with the step surfaces at the two ends of the middle section;

4. The Z-axis lifting device according to claim 3, wherein,

the first connecting piece comprises a first fixing piece and a first bearing, the first fixing piece is connected to the vertical frame, a mounting groove is formed in the first fixing piece, and the first bearing is inserted into the mounting groove;

5. The Z-axis lifting device according to claim 3, wherein,

the driving piece comprises a motor and a coupler, the motor is connected to the vertical frame, one end of the coupler is connected with an output shaft of the motor, and the other end of the coupler is connected with a second end section of the screw rod;

6. The Z-axis lifting device according to claim 3, wherein,

the bracket further comprises two second connecting pieces, and the two second connecting pieces are correspondingly connected to the two ends of the transverse frame;

7. The Z-axis lifting device of claim 6, wherein,

the transmission mechanism comprises a synchronous belt, a first synchronous wheel and a second synchronous wheel, and a first step is formed between a first end section and a middle section of the screw rod;

8. The Z-axis lifting device of claim 7, wherein,

the second connecting piece comprises a second fixing piece and a second bearing, the second fixing piece is connected with the transverse frame, a through hole is formed in the second fixing piece, and the second fixing piece is sleeved outside the second bearing through the through hole and is abutted against a flange of the second bearing;

9. The Z-axis lifting device of claim 8, wherein,

annular bosses are arranged on the end faces of the first synchronous wheel and the second synchronous wheel, and the annular bosses are abutted with the inner ring of the second bearing.

10. A three-dimensional printer, comprising: the Z-axis lifting device according to any one of claims 2 to 9.